He may probably be hitting a growth-spurt.
At these times, they feed MORE and more frequently.
IF you nurse, on-demand... your breasts are supposed to produce enough breastmilk to keep up with your baby and its increases.
This is what growth-spurts also do... make your breasts produce more milk. In order to keep up with your baby's appetite.
If you supplement him with other stuff/Formula... instead of breastfeeding, then your breasts will NOT produce enough milk... because your breasts will think it does not have to produce enough... because you are supplementing with Formula.
MANY babies, also do what is called "cluster feeding" and this means they feed even EVERY single hour. And this is normal.
He is growing.
They get fussy when hungry. Thus, nurse on-demand.
If he is satisfied, after nursing and falls asleep, then he is probably satisfied and got enough milk.
Yes, babies can take a long time to nurse.
Mine did.
And I nursed from BOTH breasts, each session. My kids as babies, drank me dry.
DO you see, your baby actually sucking AND swallowing? If so, then he is latching on properly and getting intake.
I would not, make this homemade Formula.
It is NOT... balanced nor full of essential nutrients. It is, nutritionally empty. It only has calories... from sugar.
DO NOT do this.
Feed your baby on-demand.
Check with a Lactation Specialist, if you think you are not producing milk.
When a baby is 'fussy' and wants to eat more... then they want to eat more. So nurse him. He is probably hitting a growth-spurt.
My kids as babies, had GINORMOUS appetites... and they nursed anywhere from every.single.hour... to 2 hours. Day and night. 24/7.
And I nursed, on-demand.
Then my boobs, kept up and produced enough milk.
If a baby needs to nurse, then nurse.